<template>
  <div class="login-container">
    <el-form
      ref="loginForm"
      :model="loginForm"
      :rules="loginRules"
      class="login-form"
      auto-complete="on"
      label-position="left"
    >
      <div class="title-container">
        <h3 class="title">慧通教务系统</h3>
      </div>

      <el-form-item prop="id">
        <span class="svg-container">
          <svg-icon icon-class="user" />
        </span>
        <el-input
          ref="id"
          v-model="loginForm.id"
          placeholder="请输入学号"
          name="id"
          type="text"
          tabindex="1"
          auto-complete="on"
        />
      </el-form-item>

      <el-form-item prop="password">
        <span class="svg-container">
          <svg-icon icon-class="password" />
        </span>
        <el-input
          :key="passwordType"
          ref="password"
          v-model="loginForm.password"
          :type="passwordType"
          placeholder="请输入密码"
          name="password"
          tabindex="2"
          auto-complete="on"
        />
        <span class="show-pwd" @click="showPassword">
          <svg-icon :icon-class="passwordType === 'password' ? 'eye' : 'eye-open'" />
        </span>
      </el-form-item>

      <el-form-item prop="captcha">
        <div class="captcha-input-container">
          <span class="svg-container">
            <svg-icon icon-class="email" />
          </span>
          <el-input
            ref="captcha"
            v-model="loginForm.captcha"
            placeholder="请输入验证码"
            name="captcha"
            type="text"
            tabindex="3"
          />
        </div>
        <div class="captcha-image-container">
          <img :src="captchaUrl" class="captcha" @click="getCaptcha">
        </div>
      </el-form-item>

      <el-form-item prop="role">
        <RoleRadio v-model="loginForm.role" student teacher admin />
      </el-form-item>

      <el-button
        :loading="loading"
        type="primary"
        style="width:100%;margin-bottom:30px;"
        @click.native.prevent="handleLogin"
      >登录</el-button>
    </el-form>
  </div>
</template>

<script>
import RoleRadio from '@/components/Radio/RoleRadio'
import { ROLE } from '@/constant/user'
import { userIdPattern, passwordPattern, captchaPattern } from '@/utils/validate'
import { getCaptcha } from '@/api/auth'

export default {
  name: 'Login',
  components: { RoleRadio },
  data() {
    return {
      loginForm: {
        id: '202110003886',
        password: 'Cyh1975865247',
        role: ROLE.ADMIN,
        uuid: '',
        captcha: ''
      },
      loginRules: {
        id: [
          { required: true, message: '请输入学号', trigger: 'blur' },
          { pattern: userIdPattern, message: '学号必须为12位数字', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          {
            pattern: passwordPattern,
            message: '密码至少为8位并包含数字和大小写字母',
            trigger: 'blur'
          }
        ],
        captcha: [
          { required: true, message: '请输入验证码', trigger: 'blur' },
          { pattern: captchaPattern, message: '验证码错误', trigger: 'blur' }
        ]
      },
      captchaUrl: '',
      loading: false,
      passwordType: 'password',
      redirect: undefined
    }
  },
  watch: {
    $route: {
      handler: function(route) {
        this.redirect = route.query && route.query.redirect
      },
      immediate: true
    }
  },
  created() {
    this.getCaptcha()
  },
  methods: {
    /**
     * 获取验证码
     */
    async getCaptcha() {
      const data = await getCaptcha()
      this.captchaUrl = 'data:image/gif;base64,' + data.image
      this.loginForm.uuid = data.uuid
    },
    /**
     * 切换密码显示状态
     */
    showPassword() {
      this.passwordType = this.passwordType === 'password' ? '' : 'password'
      this.$nextTick(() => {
        this.$refs.password.focus()
      })
    },
    /**
     * 登录系统
     */
    handleLogin() {
      this.$refs.loginForm.validate(valid => {
        if (valid) {
          this.loading = true
          this.$store.dispatch('user/login', this.loginForm).then(() => {
            this.$router.push({ path: this.redirect || '/' })
            this.loading = false
          }).catch(async() => {
            this.loginForm.captcha = ''
            await this.getCaptcha()
            this.loading = false
          })
        }
      })
    }
  }
}
</script>

<style lang="scss">
/* 修复input 背景不协调 和光标变色 */
$bg: #283443;
$light_gray: #fff;
$cursor: #fff;

@supports (-webkit-mask: none) and (not (cater-color: $cursor)) {
  .login-container .el-input input {
    color: $cursor;
  }
}

/* reset element-ui css */
.login-container {
  .el-input {
    display: inline-block;
    height: 47px;
    width: 85%;

    input {
      background: transparent;
      border: 0px;
      -webkit-appearance: none;
      border-radius: 0px;
      padding: 12px 5px 12px 15px;
      color: $light_gray;
      height: 47px;
      caret-color: $cursor;

      &:-webkit-autofill {
        box-shadow: 0 0 0px 1000px $bg inset !important;
        -webkit-text-fill-color: $cursor !important;
      }
    }
  }

  .el-form-item {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
    border-radius: 5px;
    color: #454545;
  }
}
</style>

<style lang="scss" scoped>
$bg: #2d3a4b;
$dark_gray: #889aa4;
$light_gray: #eee;

.login-container {
  min-height: 100%;
  width: 100%;
  background-color: $bg;
  overflow: hidden;

  .login-form {
    position: relative;
    width: 520px;
    max-width: 100%;
    padding: 160px 35px 0;
    margin: 0 auto;
    overflow: hidden;
  }

  .role {
    font-size: 14px;
    color: #fff;
    margin-bottom: 10px;
  }

  .svg-container {
    padding: 6px 5px 6px 15px;
    color: $dark_gray;
    vertical-align: middle;
    width: 30px;
    display: inline-block;
  }

  .title-container {
    position: relative;

    .title {
      font-size: 26px;
      color: $light_gray;
      margin: 0px auto 40px auto;
      text-align: center;
      font-weight: bold;
    }
  }

  .show-pwd {
    position: absolute;
    right: 10px;
    top: 7px;
    font-size: 16px;
    color: $dark_gray;
    cursor: pointer;
    user-select: none;
  }

  .captcha-input-container {
  width: calc(100% - 100px);
  display: inline-block;
  }

  .captcha-image-container {
    width: 100px;
    display: inline-block;
    vertical-align: middle;

    img {
      width: 100%;
      height: auto;
      cursor: pointer;
    }
  }
}
</style>
